Hi,
I have following query:
SELECT Id,Name FROM MyObject__c WHERE MyUser__r.NameCustom__c = 'Test'. 
Here NameCustom__c is Index field in MyUser__c. If all the thresholds are in limit will the above query will be indexed or not? Or since the query filter in spanning in two different objects it will not be filtered? 
 

I went through the entire walkthrough here.
https://trailhead.salesforce.com/projects/build-a-private-alexa-for-business-skill-for-salesforce/

I am having issues account linking to Alexa.
I posted to Amazons Dev forums already. Amazon is telling me now this is a salesforce issue:
https://forums.developer.amazon.com/questions/164732/error-a-salesforce-account-is-required-to-use-this.html#answer-164936

It says I linked the account successfully to Alexa. But now I get this error:
"You need to relink your Salesforce account in order to use this skill. I've placed more information on a card in your Alexa app."

Any idea what I need to do at this point? 

Stephen